Legend:Suppression = how fast the ATTACKING unit suppresses targetsReceived suppression = how much faster/slower the unit which is being shot at gets suppressedCooldown time = each bullets-firing weapon has a magazine. When the magazine is empty the weapon needs to RELOAD. Before the magazine is empty, the weapon has some duration between each shot/burst - this duration is COOLDOWN, so "cooldown reduction" = fires the content of magazine faster.

US Captain: (applies to all US infantry except for AB units)Vet0:Received suppression: -50%Sight radius: +25% (this is the reason why Spotters under command aura have so huge sight)Accuracy: +12.5%Vet2:Received experience: +25%Weapon cooldown time: -10%Weapon reload time: -10%Received Damage: -15%Vet4: Weapon damage: +15%Pop cap: +4 (Remnant of vCoH system - in BK is not very useful as people play with fixed 250 pop cap)

CW Lieutenant: (applies to all CW infantry except for Commandos units)Vet0: Accuracy: +10% (does NOT stack when more LTs are nearby)Damage: +2.5% (stacks when more LTs are nearby)Damage: +2.5% (does NOT stack when more LTs are nearby)Makes units move faster if in enemy/neutral territory (does NOT stack when more LTs are nearby)Vet1:Enables "Heroic Charge" ability (for details check Numbers behind abilities)Vet2:Weapon reload speed: -10% (stacks when more LTs are nearby)Received experience: +15% (does NOT stack with other XP bonus providing modifiers)Received suppression: -10% Weapon cooldown speed: -10%Vet3:Pop cap: +4You can have multiple Lieutenants and their bonuses stack on infantry so the bonuses are overall lower than bonuses of Officers of other factions.Stacking: When you have 1LT near your troops he provides the +2.5% damage and at the same time another +2.5% damage but when another LT comes he only provides additional +2.5 damage so when two LTs command one squad they have +7.5% damage (not +10%) and in the same way 3LTs provide +10% damage instead of expected +15%.

I remember seeing "improved command aura" float above the officers head, but wasn't 100% certain of when or if it did increase the range. I went and tested to verify and see and it happens on Vet 2 and the officer did effect units that were further out.